You can set the number of threads using the environment variable OMP_NUM_THREADS. To change the number of OpenMP threads, use the appropriate command in the command shell in which the program is going to run, for example:
- For the bash shell, enter:
export OMP_NUM_THREADS=<number of threads to use>
- For the csh or tcsh shell, enter:
setenv OMP_NUM_THREADS <number of threads to use>
For more complete information about compiler optimizations, see our Optimization Notice.